Which Royal Couple Is the Latest to Join the Tweeting Masses?

Fresh from inadvertently swearing in Spanish during a conference earlier this week, Holland's Willem-Alexander, Prince of Orange, concluded his four-day trip to Mexico with a visit to Teotihuacan's awe-inspiring ruins with his wife, Princess Maxima. The Prince's mother, Queen Beatrix, accompanied the couple to the archaeological site, but declined to join them in climbing the magnificent Pyramid of the Sun, missing the photo-op at the pyramid's summit. (Fear not—the Queen had her fun during an official visit to Mexico in 1968, when she scaled the ancient pyramid.)A little bird told us that Norway's Crown Prince Haakon and his wife, Crown Princess Mette-Marit, have joined Queen Rania of Jordan and the British monarchy in the ranks of royal Twitterers. The striking regal couple also posts photos and updates through a joint Facebook account. However, would-be royal watchers beware: unless you know your katter from your hunder, you'll have trouble keeping up with the Prince and Princess: they've been sticking exclusively to their native Norwegian.